A wastewater treatment system for industrial parks to reduce pollutant emissions

Abstract

This utility model relates to the field of wastewater treatment technology, and in particular to a wastewater treatment system for industrial parks used to reduce pollutant emissions. The system includes an industrial wastewater treatment device and a domestic wastewater treatment device. The industrial wastewater treatment device includes, in sequence, an underground buffer tank, a demulsification reaction tank, a paper tape oil separator, a wastewater collection tank, a physicochemical flat-plate biological bed, a first dissolved air flotation tank, and a first sludge tank. The domestic wastewater treatment device includes, in sequence, a bar screen, an equalization tank, a domestic flat-plate biological bed, a second dissolved air flotation tank, and a second sludge tank. The first and second dissolved air flotation tanks are connected via pipelines and output as treated wastewater that meets emission standards. This system separates industrial and domestic wastewater treatment, specifically by converting the original MBR membrane tank into a flat-plate biological bed and the primary treatment tank into a flat-plate biological bed. Carbon removal / nitrification reactions are achieved through the biofilm carrier (packing material), improving the efficiency of organic matter degradation and reducing the COD, ammonia nitrogen, and sludge volume in the effluent.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to a wastewater treatment system for industrial parks used to reduce pollutant emissions. Background Technology

[0002] Industrial parks generate various types of industrial and domestic wastewater. Industrial wastewater, produced during industrial production, typically contains various pollutants such as heavy metals, organic matter, acids, alkalis, and suspended solids. Its complex composition and high pollutant concentrations pose a significant threat to the environment. Domestic wastewater, generated during daily life, primarily originates from residential areas, commercial areas, and public facilities. Its composition is relatively simple, mainly containing organic matter, nitrogen, phosphorus, and pathogens.

[0003] The factory needs to treat industrial and domestic wastewater. The general treatment process is as follows: industrial wastewater is collected and pre-treated, then mixed and homogenized with domestic wastewater, before entering an activated sludge aerobic tank for biochemical treatment. Finally, it passes through an MBR (membrane bioreactor) tank for sludge-water separation before being discharged in compliance with standards. Conventional MBR processes can effectively achieve sludge-water separation.

[0004] Currently, the conventional MBR process still has the following problems:

[0005] MBR membranes are prone to fouling: MBR membranes are easily clogged by high concentrations of organic matter and suspended solids, requiring frequent cleaning or replacement, resulting in high operation and maintenance costs and labor costs.

[0006] Poor resistance to shock loads: The aerobic biological treatment section uses activated sludge technology, which is sensitive to water quality fluctuations and its treatment efficiency is easily affected by the complexity of industrial wastewater composition.

[0007] Large sludge production: The remaining sludge requires frequent dewatering treatment, resulting in high hazardous waste disposal costs.

[0008] Therefore, there is an urgent need to provide an industrial and domestic wastewater treatment system that has low operation and maintenance costs and high wastewater treatment efficiency. Utility Model Content

[0009] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide an industrial park wastewater treatment system for reducing pollutant emissions, which solves the problems of high operation and maintenance costs and low wastewater treatment efficiency of the MBR membrane process in the prior art.

[0010] To achieve the above-mentioned objectives and other related objectives, this utility model is obtained through the following technical solution.

[0011] The present invention provides an industrial park wastewater treatment system for reducing pollutant emissions, the system comprising an industrial wastewater treatment device and a domestic wastewater treatment device.

[0012] The industrial wastewater treatment device includes, in sequence, an underground buffer tank, a demulsification reaction tank, a wastewater collection tank, a physicochemical plate biological bed, an air flotation tank, and a sludge tank;

[0013] The domestic wastewater treatment device includes a bar screen, an equalization tank, a domestic flat biological bed, a second air flotation tank, and a second sludge tank, which are connected in sequence.

[0014] The first and second air flotation tanks are connected by pipelines and output to discharge compliant wastewater.

[0015] As described above, the industrial park wastewater treatment system of this utility model for reducing pollutant emissions has the following beneficial effects:

[0016] (1) The industrial wastewater and domestic wastewater co-treatment system of this utility model treats industrial wastewater and domestic wastewater separately. That is, the original MBR membrane tank is transformed into a physical and chemical plate biological bed, and the original biological tank is transformed into a domestic plate biological bed. Carbon removal / nitrification reaction is achieved through the biofilm carrier (filler), which improves the organic matter degradation efficiency and reduces the COD, ammonia nitrogen and sludge amount of the system effluent.

[0017] (2) The industrial wastewater and domestic wastewater co-treatment system of this utility model dehydrates and transports the sludge (hazardous waste) generated from industrial wastewater and the sludge (general waste) generated from domestic wastewater separately, thereby realizing the treatment of sludge by quality and reducing disposal costs.

[0018] (3) The industrial wastewater and domestic wastewater co-treatment system of this utility model is equipped with a rotating bar screen to effectively intercept garbage and particulate matter in domestic wastewater, greatly reducing the chance of blockage in subsequent process equipment and laying the foundation for the good operation of the entire wastewater treatment system; a vertical air flotation tank is added as a secondary sedimentation tank at the end of the flat plate biological bed process. This equipment has the advantages of small footprint and the ability to remove suspended solids and floating oil; a screw press dewatering machine is added to treat oily industrial wastewater sludge; the original diaphragm plate and frame filter press treats domestic wastewater sludge. Since no chemical agents are added in the entire domestic wastewater treatment process, domestic wastewater sludge can be treated as general waste, achieving the goal of separate treatment from industrial wastewater sludge (hazardous waste).

[0019] (4) The system of this utility model eliminates the MBR membrane module, reducing annual maintenance costs by 40% and sludge production by 22%. Attached Figure Description

[0020] Figure 1 The diagram shown is a schematic of an industrial park wastewater treatment system for reducing pollutant emissions according to this utility model.

[0021] Figure 2 The image shows a comparison of the industrial wastewater and domestic wastewater systems before and after the modification of this utility model.

[0022] Figure 3 The diagram shows the changes in COD before and after the modification.

[0023] Figure 4 The diagram shows the changes in ammonia nitrogen before and after the modification.

[0024] Figure 5 The diagram shows the change in sludge volume of a single unit before and after the modification.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. Industrial wastewater treatment unit; 11. Underground buffer tank; 12. Demulsification reaction tank; 13. Paper strip oil removal machine; 14. Wastewater collection tank; 15. Physicochemical plate biological bed; 16. Dissolved air flotation tank one; 17. Sludge tank one; 18. Dewatering machine one; 2. Domestic wastewater treatment unit; 21. Bar screen; 22. Equalization tank; 23. Domestic plate biological bed; 24. Dissolved air flotation tank two; 25. Sludge tank two; 26. Dewatering machine two. Detailed Implementation

[0027] To make the invention objective, technical solution and beneficial technical effects of this utility model clearer, the following describes this utility model in further detail with reference to the embodiments. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0028] Figure 2 This is a comparison diagram of the industrial wastewater and domestic wastewater systems before and after the modification of this utility model. This utility model adopts a four-stage process chain of "demulsification → paper tape oil removal machine → flat plate biological bed biological treatment → air flotation separation (secondary sedimentation tank)" to replace the original four-stage process flow of "demulsification → air flotation → activated sludge aerobic biological treatment → MBR sludge-water separation", thus eliminating the risk of membrane fouling.

[0029] Industrial wastewater and domestic wastewater are treated separately. The original MBR tank is transformed into an industrial wastewater horizontal plate biological bed, and the original aerobic biological treatment tank is transformed into a domestic wastewater horizontal plate biological bed process tank. Carbon removal / nitrification reaction is achieved through biofilm carrier (flat biological suspension packing), which improves the degradation efficiency of organic matter and reduces the amount of COD, ammonia nitrogen and sludge in the system effluent.

[0030] The original MBR membrane chemical cleaning tank was replaced with a domestic sludge tank, which is the sludge tank II of this application.

[0031] A paper tape oil remover was added to treat industrial wastewater, and a screw press was used to replace the diaphragm filter press to treat the sludge obtained after industrial wastewater treatment.

[0032] A bar screen and a second flotation tank were added to treat domestic wastewater. The second flotation tank is a vertical flow flotation trough.

[0033] The present invention provides an industrial park wastewater treatment system for reducing pollutant emissions, the system comprising an industrial wastewater treatment device and a domestic wastewater treatment device.

[0034] The industrial wastewater treatment device includes, in sequence, an underground buffer tank, a demulsification reaction tank, a paper strip oil remover, a wastewater collection tank, a physicochemical plate biological bed, an air flotation tank, and a sludge tank;

[0035] The domestic wastewater treatment device includes a bar screen, an equalization tank, a domestic flat biological bed, a second air flotation tank, and a second sludge tank, which are connected in sequence.

[0036] The first and second air flotation tanks are connected by pipelines and output to discharge compliant wastewater.

[0037] In some embodiments of this utility model, the bar screen machine is existing technology.

[0038] In some embodiments of this utility model, the industrial wastewater treatment device further includes a dewatering machine, which is connected to a sludge tank. The dewatering machine is a screw press. The screw press is existing technology. This utility model does not have any special limitations on the selection of the screw press; any screw press commonly used by those skilled in the art can be used. Screw presses are relatively inexpensive, especially small screw presses, which significantly reduce costs compared to traditional sludge presses. They can operate 24 hours a day without interruption, greatly saving labor costs. The entire structure is made of 304 stainless steel, which has good wear resistance and durability. It can treat sludge generated by almost all industries, and its treatment effect on activated sludge is particularly outstanding. In addition, the screw press has a small footprint, low operating costs, high degree of automation, stable treatment effect, simple operation, and convenient maintenance. Specifically, the working principle of the screw press is as follows: sludge enters the main body of the screw press, starting the key process of concentration and dewatering. The moving rings and fixed rings inside the main body are arranged alternately. Driven by the screw shaft, the moving rings rotate slowly relative to the fixed rings and gradually move forward. During this process, the sludge is continuously squeezed, water flows out through the gaps between the rings, and the sludge is gradually concentrated. At the same time, the presence of the pressure plate further hinders the reverse flow of the sludge, enhancing the dewatering effect. Finally, the sludge, after being pressed by the screw press, is discharged from the outlet.

[0039] In some embodiments of this utility model, the sludge tank is connected to the demulsification reaction tank.

[0040] In some embodiments of this utility model, the domestic wastewater treatment device further includes a second dewatering machine, which is connected to a second sludge tank. The second dewatering machine is a diaphragm filter press. The diaphragm filter press is existing technology, and this utility model does not have any special limitations on the selection of the diaphragm filter press; any diaphragm filter press commonly used by those skilled in the art can be used. A diaphragm filter press is a filter press in which an elastic membrane is installed between the filter plate and the filter cloth. During use, when the feeding is finished, a high-pressure fluid or gas medium can be injected into the diaphragm plate. At this time, the entire diaphragm will bulge and compress the filter cake, thereby achieving further dewatering of the filter cake.

[0041] In some embodiments of this utility model, the pump used for pumping on the pipeline of the industrial wastewater treatment device is a lift pump.

[0042] In some embodiments of this utility model, the pump used for pumping on the pipeline of the domestic wastewater treatment device is a lift pump.

[0043] The aforementioned lift pump is existing technology. Wastewater treatment plants typically use gravity flow to pass through various structures and equipment during their operational processes. However, due to limitations imposed by the plant's topography and geology, lift pump stations must be added at the pretreatment stage to raise the wastewater to a certain height before it can operate using the gravity flow method. The function of the wastewater lift pump station is to elevate the wastewater from upstream to the height required by subsequent treatment units, enabling it to flow by gravity.

[0044] In some embodiments of this utility model, the bar screen is a rotary drum bar screen. The aperture of the bar screen is 1-2 mm. Preferably, the aperture of the bar screen is 1 mm. The rotary drum bar screen is existing technology, and this utility model does not have any special limitations on the selection of the rotary drum bar screen; any equipment commonly used by those skilled in the art can be used. The rotary drum part of the rotary drum bar screen consists of a cylindrical filter screen with fine bar screen pores distributed on its surface. When sewage enters the rotary drum bar screen, the drive device drives the drum to rotate slowly. During the rotation, solid impurities in the sewage, such as suspended solids, fibers, and plastics, are intercepted on the surface of the filter screen of the drum. As the drum continues to rotate, the intercepted impurities are gradually lifted to the upper part of the drum. At the same time, the flushing device sprays water onto the surface of the drum to wash away the impurities attached to the filter screen. The washed-off impurities fall into the collection tank or conveying device below under the action of gravity. The filtered sewage then flows out through the bar screen pores of the drum and enters the subsequent treatment stage.

[0045] In some embodiments of this utility model, the flotation tank is a coagulation flotation tank. The coagulation flotation tank is existing technology.

[0046] In some embodiments of this utility model, the second air flotation tank is a vertical flow air flotation tank. The vertical flow air flotation tank is existing technology.

[0047] In some embodiments of this utility model, an air flotation dissolved air device is installed inside the air flotation tank. A conventional air flotation dissolved air device consists of a dissolved air pump for dissolved air water, an air compressor for dissolved air water, a dissolved air tank, and corresponding pipelines. In the dissolved air tank generator, pressurized water and pressurized air form dissolved air water, which is then distributed into the air flotation tank via a delivery pipeline and a release device located within the air flotation tank.

[0048] In some embodiments of this invention, a compressed air agitator is provided inside the wastewater collection tank. This compressed air agitator is prior art and is commercially available.

[0049] In some embodiments of this utility model, the lower part of the sludge tank is a cone shape with a horizontal cross-section that gradually decreases from top to bottom, and the upper part of the sludge tank is cylindrical or rectangular; the cone angle at the bottom is 55-60°, which facilitates the natural sliding and collection of sludge.

[0050] In some embodiments of this utility model, the lower part of the sludge tank two is tapered, with the horizontal cross-section gradually decreasing from top to bottom, while the upper part of the sludge tank two is cylindrical or rectangular. The cone angle at the bottom is 55-60°, which facilitates the natural sliding and collection of sludge.

[0051] In some embodiments of this utility model, both the physical and chemical plate-type biological bed and the living plate-type biological bed are plate-type biological beds. Plate-type biological beds are also known as fixed-bed plate packing, plate-type biological suspension packing, and modified plate-type biological biofilm packing. Plate-type biological beds are plate-type biological suspension packing, a type of microbial immobilization carrier, and are widely used in wastewater treatment engineering. Their unique structural design employs a series of processes such as fiber spinning, needle punching, napping, and heat setting to form a special structure of a "double-layer membrane" and a "pore layer." This design not only achieves a large specific surface area (greater than 850 m²), but also... 2 / m 3 The packing material features high porosity (reaching 0.98), which also enhances its mechanical strength. During processing, the packing material undergoes modification with ionized materials and hydrophilic polymer blends, resulting in a positively charged surface that facilitates microbial attachment and fixation. This application does not have specific limitations on the selection of the flat-plate biological bed; commonly used flat-plate biological beds in this field can be employed.

[0052] Please see Figure 1-2It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are only for clarity of description and are not intended to limit the scope of implementation of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of implementation of this utility model.

[0053] See Figure 1-2 This utility model provides an industrial park wastewater treatment system for reducing pollutant emissions.

[0054] See Figure 1-2 An industrial park wastewater treatment system for reducing pollutant emissions includes an industrial wastewater treatment unit 1 and a domestic wastewater treatment unit 2. This system treats industrial and domestic wastewater separately, and then mixes the treated industrial and domestic wastewater before discharging them in compliance with standards, thereby improving the stability of wastewater treatment.

[0055] In some embodiments of this utility model, such as Figure 1-2 As shown, the industrial wastewater treatment device 1 includes, in sequence, an underground buffer tank 11, a demulsification reaction tank 12, a wastewater collection tank 14, a physicochemical flat-plate biological bed 15, an air flotation tank 16, and a sludge tank 17, all in fluid communication. The inlet of the underground buffer tank 11 is connected to the industrial wastewater discharge pipeline, the outlet of the underground buffer tank 11 is connected to the inlet of the demulsification reaction tank 12, the outlet of the demulsification reaction tank 12 is connected to the inlet of the wastewater collection tank 14, the outlet of the wastewater collection tank 14 is connected to the inlet of the physicochemical flat-plate biological bed 15, the outlet of the physicochemical flat-plate biological bed 15 is connected to the inlet of the air flotation tank 16, and the sludge outlet of the air flotation tank 16 is connected to the sludge inlet of the sludge tank 17. The wastewater is discharged after being treated to meet standards in the air flotation tank 16. By replacing the MBR membrane module with a flat-plate biological bed, the annual maintenance cost is reduced, and the sludge moisture content is lowered.

[0056] In some embodiments of this utility model, such as Figure 1-2As shown, the industrial wastewater treatment device 1 further includes a dewatering machine 18, which is connected to a sludge tank 17. The sludge outlet of the sludge tank 17 is connected to the sludge inlet of the dewatering machine 18. The dewatering machine 18 is a screw press. In some embodiments of this utility model, the bottom of the sludge tank 17 is conical, and the upper part is cylindrical or rectangular, which facilitates better pre-concentration of sludge and improves sludge dewatering efficiency. The sludge tank 17 is connected to a demulsification reaction tank 12; the sludge outlet of the demulsification reaction tank 12 is connected to the sludge inlet of the sludge tank 17, and the sludge generated in the demulsification reaction tank 12 is pumped to the sludge tank 17 for treatment by a lift pump.

[0057] In some embodiments of this utility model, such as Figure 1-2 As shown, the flotation tank 16 is a coagulation flotation tank, and the flotation tank 16 is equipped with a flotation dissolved air device to facilitate the removal of suspended solids, colloids and some dissolved pollutants in the water.

[0058] In some embodiments of this utility model, such as Figure 1-2 As shown, the wastewater collection tank 14 is equipped with a compressed air agitator.

[0059] In some embodiments of this utility model, such as Figure 1-2 As shown, the domestic wastewater treatment device 2 includes a bar screen 21, an equalization tank 22, a domestic wastewater flat-plate biological bed 23, a second dissolved air flotation tank 24, and a second sludge tank 25, all connected in fluid order. The inlet of the bar screen 21 is connected to the domestic wastewater discharge pipe, the outlet of the bar screen 21 is connected to the inlet of the equalization tank 22, the outlet of the equalization tank 22 is connected to the inlet of the domestic wastewater flat-plate biological bed 23, the outlet of the domestic wastewater flat-plate biological bed 23 is connected to the inlet of the second dissolved air flotation tank 24, and the sludge outlet of the second dissolved air flotation tank 24 is connected to the sludge inlet of the second sludge tank 25. Replacing the MBR membrane module with a flat-plate biological bed reduces annual maintenance costs and increases sludge dewatering rate.

[0060] In some embodiments of this utility model, such as Figure 1-2 As shown, the domestic wastewater treatment device 2 also includes a second dewatering machine 26, which is connected to a second sludge tank 25. The sludge outlet of the second sludge tank 25 is connected to the sludge inlet of the second dewatering machine 26. The second dewatering machine 26 is a diaphragm filter press. In some embodiments of this utility model, the bottom of the second sludge tank 25 is conical, and the upper part is cylindrical or rectangular, which facilitates better pre-concentration of sludge and improves sludge dewatering efficiency.

[0061] In some embodiments of this utility model, such as Figure 1-2 As shown, the second flotation tank 24 is a vertical flow flotation tank, which is convenient for removing suspended solids, colloids and some dissolved pollutants from the water.

[0062] In some embodiments of this utility model, such as Figure 1-2 As shown, the first flotation tank 16 and the second flotation tank 24 are connected by pipelines and output to discharge compliant wastewater.

[0063] Working principle:

[0064] Industrial wastewater and domestic wastewater are separated in the factory. Industrial wastewater enters the underground buffer tank 11, and is then pumped to the demulsification reaction tank 12. After demulsification by salt precipitation, floating oil is skimmed off and transported for treatment. Sludge is discharged into sludge tank 17. After adjusting the pH of the demulsified wastewater to neutral, it is pumped to the paper tape oil separator 13 for further removal of floating oil. The wastewater then flows by gravity into the wastewater collection tank 14 for mixing and homogenization, and is then pumped to the process tank of the physicochemical plate biological bed 15. Plate biological suspended packing is added to the process tank of the physicochemical plate biological bed 15. The effluent from the physicochemical plate biological bed 15 undergoes solid-liquid separation in the air flotation tank 16 to obtain clear water. Sludge is discharged into the sludge tank 17 for pre-concentration, and then dewatered by the dewatering machine 18. Hazardous sludge is transported off-site for treatment. Domestic wastewater flows into equalization tank 22 after solid waste is removed by bar screen 21 (1mm aperture). Wastewater in equalization tank 22 is pumped to domestic flat biological bed 23 by lift pump. The effluent from domestic flat biological bed 23 is separated from the scum by air flotation tank 24 to obtain clean water, which is mixed with the clean water obtained from industrial wastewater treatment and discharged in compliance with standards. Sludge (scum) is pre-concentrated in sludge tank 25 and then enters dewatering machine 26 for dewatering treatment. Ordinary waste sludge is transported off-site for disposal.

[0065] This utility model, after being applied and tested in practice, has shown excellent technical effects, such as... Figure 3 As shown, the average monthly COD emission before the renovation was 151.8 mg / L, and the average monthly COD emission after the renovation was 126.8 mg / L, a reduction of approximately 16.5%. Figure 4 As shown, the average monthly ammonia nitrogen emission before the modification was 16.6 mg / L, and the average monthly ammonia nitrogen emission after the modification was 14.8 mg / L, a reduction of approximately 10.96%. Figure 5 As shown, before and after the upgrade, the sludge production per unit decreased from 410 grams to approximately 320 grams, a reduction of about 22%. The industrial and domestic wastewater co-treatment process based on the flat-plate biological bed technology reduced COD emissions by 16.5% and ammonia nitrogen emissions by 11% compared to before the upgrade; eliminating the MBR membrane module reduced annual maintenance costs by 40% and sludge production by 22%.

[0066] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. An industrial park wastewater treatment system for reducing pollutant emissions, characterized in that, The system includes an industrial wastewater treatment device (1) and a domestic wastewater treatment device (2); The industrial wastewater treatment device (1) includes an underground buffer tank (11), a demulsification reaction tank (12), a paper strip oil remover (13), a wastewater collection tank (14), a physicochemical plate biological bed (15), an air flotation tank (16), and a sludge tank (17) that are connected in sequence. The domestic wastewater treatment device (2) includes a bar screen (21), an equalization tank (22), a domestic flat biological bed (23), an air flotation tank (24), and a sludge tank (25) that are connected in sequence. The first flotation tank (16) and the second flotation tank (24) are connected by pipelines and output to discharge qualified wastewater.

2. An industrial park wastewater treatment system for reducing the amount of pollutants emitted according to claim 1, characterized in that: The industrial wastewater treatment device (1) further includes a dewatering machine (18) connected to a sludge tank (17); and / or, the sludge tank (17) connected to a demulsification reaction tank (12).

3. An industrial park wastewater treatment system for reducing the amount of pollutants emitted according to claim 2, characterized in that: The dehydrator (18) is a screw press.

4. The industrial park wastewater treatment system for reducing the amount of pollutant emissions according to claim 1, characterized in that: The domestic wastewater treatment device (2) also includes a dewatering machine (26), which is connected to a sludge tank (25).

5. An industrial park wastewater treatment system for reducing the amount of pollutants emitted according to claim 4, characterized in that: The dehydrator 2 (26) is a diaphragm filter press.

6. An industrial park wastewater treatment system for reducing the amount of pollutants emitted according to claim 1, characterized in that: The bar screen (21) is a rotary drum bar screen.

7. An industrial park wastewater treatment system for reducing the amount of pollutants emitted according to claim 6, characterized in that: The aperture of the bar screen (21) is 1-2 mm.

8. An industrial park wastewater treatment system for reducing the amount of pollutants emitted according to claim 1, characterized in that: The lower part of the sludge tank one (17) is a cone shape with a horizontal cross-section that gradually decreases from top to bottom, and the upper part of the sludge tank one (17) is cylindrical or rectangular; and / or, the lower part of the sludge tank two (25) is a cone shape with a horizontal cross-section that gradually decreases from top to bottom, and the upper part of the sludge tank two (25) is cylindrical or rectangular.

9. The industrial park wastewater treatment system for reducing pollutant emissions according to claim 1, characterized in that: The first flotation tank (16) is a coagulation flotation tank; and / or the second flotation tank (24) is a vertical flow flotation tank.

10. The industrial park wastewater treatment system for reducing the amount of pollutant emissions according to claim 1, characterized in that: The air flotation tank (16) is equipped with an air flotation dissolved air device; and / or, the wastewater collection tank (14) is equipped with a compressed air agitator.

Images